How to be enjoy spending money while being married

My husband and I have a joint account to pay our major bills.
I also have my very own account. I take 5% to 10% of each of my paychecks and deposit it into my account. I have the freedom to do whatever I want with it. For example I've been depositing it into my Roth IRA and spending it all in the mall! Having my own bit of money feels so empowering and prevents any money arguments with my husband.